A large batch of carbon nanotubes is first electrolessly modified with gold nanoparticles and then a small amount of the resulting AuCNTs was deposited on a glassy carbon surface simply by putting a small drop of a dilute AuCNTs suspension in chloroform on to the surface followed by evaporation at room temperature. The coverage of the GNPs on the carbon nanotubes is such that the nanotubes themselves can simply be considered as a high area support and the electroactivity arises solely from the GNPs. Anodic stripping voltammetry was performed with nano molar arsenic standard additions in the form of linear sweep voltammetry (LSV) and square wave voltammetry (SWV) using an optimised system and a deposition time of 120s where a satisfactory LOD of 0.1±0.05gL−1 was obtained.